interface PrintFunction {
  extendOptions: Function
  getStyle: Function
  setDomHeight: Function
  toPrint: Function
}

const Print = function (dom, options?: object): PrintFunction {
  options = options || {}
  // @ts-expect-error
  if (!(this instanceof Print)) return new Print(dom, options)
  // @ts-expect-error
  this.conf = {
    styleStr: '',
    // Elements that need to dynamically get and set the height
    setDomHeightArr: [],
    // Callback before printing
    printBeforeFn: null,
    // Callback after printing
    printDoneCallBack: null,
  }
  // @ts-expect-error
  for (const key in this.conf) {
    if (key && options.hasOwnProperty(key)) {
      // @ts-expect-error
      this.conf[key] = options[key]
    }
  }
  if (typeof dom === 'string') {
    // @ts-expect-error
    this.dom = document.querySelector(dom)
  } else {
    // @ts-expect-error
    this.dom = this.isDOM(dom) ? dom : dom.$el
  }
  // @ts-expect-error
  if (this.conf.setDomHeightArr && this.conf.setDomHeightArr.length) {
    // @ts-expect-error
    this.setDomHeight(this.conf.setDomHeightArr)
  }
  // @ts-expect-error
  this.init()
}

Print.prototype = {
  /**
   * init
   */
  init: function (): void {
    const content = this.getStyle() + this.getHtml()
    this.writeIframe(content)
  },
  /**
   * Configuration property extension
   * @param {Object} obj
   * @param {Object} obj2
   */
  extendOptions: function <T>(obj, obj2: T): T {
    for (const k in obj2) {
      obj[k] = obj2[k]
    }
    return obj
  },
  /**
    Copy all styles of the original page
  */
  getStyle: function (): string {
    let str = ''
    const styles: NodeListOf<Element> = document.querySelectorAll('style,link')
    for (let i = 0; i < styles.length; i++) {
      str += styles[i].outerHTML
    }
    str += `<style>.no-print{display:none;}${this.conf.styleStr}</style>`
    return str
  },
  // form assignment
  getHtml: function (): Element {
    const inputs = document.querySelectorAll('input')
    const selects = document.querySelectorAll('select')
    const textareas = document.querySelectorAll('textarea')
    const canvass = document.querySelectorAll('canvas')

    for (let k = 0; k < inputs.length; k++) {
      if (inputs[k].type == 'checkbox' || inputs[k].type == 'radio') {
        if (inputs[k].checked == true) {
          inputs[k].setAttribute('checked', 'checked')
        } else {
          inputs[k].removeAttribute('checked')
        }
      } else if (inputs[k].type == 'text') {
        inputs[k].setAttribute('value', inputs[k].value)
      } else {
        inputs[k].setAttribute('value', inputs[k].value)
      }
    }

    for (let k2 = 0; k2 < textareas.length; k2++) {
      if (textareas[k2].type == 'textarea') {
        textareas[k2].innerHTML = textareas[k2].value
      }
    }

    for (let k3 = 0; k3 < selects.length; k3++) {
      if (selects[k3].type == 'select-one') {
        const child = selects[k3].children
        for (const i in child) {
          if (child[i].tagName == 'OPTION') {
            if ((child[i] as any).selected == true) {
              child[i].setAttribute('selected', 'selected')
            } else {
              child[i].removeAttribute('selected')
            }
          }
        }
      }
    }

    for (let k4 = 0; k4 < canvass.length; k4++) {
      const imageURL = canvass[k4].toDataURL('image/png')
      const img = document.createElement('img')
      img.src = imageURL
      img.setAttribute('style', 'max-width: 100%;')
      img.className = 'isNeedRemove'
      canvass[k4].parentNode.insertBefore(img, canvass[k4].nextElementSibling)
    }

    return this.dom.outerHTML
  },
  /**
    create iframe
  */
  writeIframe: function (content) {
    let w: Document | Window
    let doc: Document
    const iframe: HTMLIFrameElement = document.createElement('iframe')
    const f: HTMLIFrameElement = document.body.appendChild(iframe)
    iframe.id = 'myIframe'
    iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;')

    // eslint-disable-next-line prefer-const
    w = f.contentWindow || f.contentDocument

    // eslint-disable-next-line prefer-const
    doc = f.contentDocument || f.contentWindow.document
    doc.open()
    doc.write(content)
    doc.close()

    const removes = document.querySelectorAll('.isNeedRemove')
    for (let k = 0; k < removes.length; k++) {
      removes[k].parentNode.removeChild(removes[k])
    }

    // eslint-disable-next-line @typescript-eslint/no-this-alias
    const _this = this
    iframe.onload = function (): void {
      // Before popping, callback
      if (_this.conf.printBeforeFn) {
        _this.conf.printBeforeFn({ doc })
      }
      _this.toPrint(w)
      setTimeout(function () {
        document.body.removeChild(iframe)
        // After popup, callback
        if (_this.conf.printDoneCallBack) {
          _this.conf.printDoneCallBack()
        }
      }, 100)
    }
  },
  /**
    Print
  */
  toPrint: function (frameWindow): void {
    try {
      setTimeout(function () {
        frameWindow.focus()
        try {
          if (!frameWindow.document.execCommand('print', false, null)) {
            frameWindow.print()
          }
        } catch {
          frameWindow.print()
        }
        frameWindow.close()
      }, 10)
    } catch (err) {
      console.error(err)
    }
  },
  isDOM:
    typeof HTMLElement === 'object'
      ? function (obj) {
          return obj instanceof HTMLElement
        }
      : function (obj) {
          return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string'
        },
  /**
   * Set the height of the specified dom element by getting the existing height of the dom element and setting
   * @param {Array} arr
   */
  setDomHeight(arr) {
    if (arr && arr.length) {
      arr.forEach((name) => {
        const domArr = document.querySelectorAll(name)
        domArr.forEach((dom) => {
          dom.style.height = dom.offsetHeight + 'px'
        })
      })
    }
  },
}

export default Print
